JP3458132B2 - Synthetic image projection device and image adjustment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus, and more particularly to a composite image projection apparatus and an image adjusting method useful for combining two or more video signals to form a large screen. is there.

[0002]

2. Description of the Related Art As a display device for visually displaying various information, a television for displaying an image on a CRT tube surface, a liquid crystal plate or the like, or a monitor device for a computer is usually used. However, since the size of the display screen of such a display device is limited, for example, only a part of the image that the viewer actually wants to see can be viewed. In addition, a projector using a projection tube or a liquid crystal plate can reproduce an image in most of the viewing angle by projecting the image on a large screen, but such a large projection device generally displays images. The larger the screen, the more difficult it is to reproduce a bright screen

Therefore, a so-called multi-vision type image projection apparatus for synthesizing a screen projected from a small projection apparatus and projecting it on a large screen is used as a method for reproducing virtual reality. FIG. 9 shows an outline of a projection device that arranges a plurality of small projection devices (liquid crystal projectors) to form a large composite screen.
Indicates a composite video display device as a whole. Screen parts 86a to 8 formed by dividing the transmissive screen 86 into four
The liquid crystal plates 81 to 84 are provided corresponding to 6d, and the liquid crystal plates 81 to 84 are irradiated with light to project the images LA ₁ to LA ₄ on the screen 86.

The optical systems 87 to 90 have the same structure,
For example, with respect to the optical system 87, the light emitted from the light source 91 is condensed on the liquid crystal plate 81 via the condenser lens 92 and the Fresnel lens 93, and the transmitted light is generated by driving the liquid crystal plate 81 by a video signal. The modulated and transmitted light is projected on the screen 86 via the field lens 94.

Similarly for the other optical systems 88, 89 and 90, since the image light transmitted through the liquid crystal plates 82, 83 and 84 is projected on the four divided areas of the screen 86, they are combined on the screen 86. A screen is formed so that a large-sized display device can be obtained. By the way, in the case of such a projection type composite image projection device, a discontinuous line of the image is generated in the adjacent portion of each projected image, and each optical system 87 is arranged to eliminate this discontinuous line. It is extremely difficult to perform alignment of ~ 90.

Therefore, in the above-mentioned conventional projector, FIG.
As shown in the screen projection image of (a), the boundaries of the image portions (LA _{1 to} LA ₄ ) to be composited on the screen 86 are overlapped so that no gap is created in the composite screen projection image. The brightness level of one of the video signals projected on the superimposed area is adjusted. Although FIG. 10B schematically shows the luminance levels of the image portions LA ₁ and LA ₂ , for example,
_The signal processing is performed such that ₁ falls from point a and gradually decreases, and image portion LA ₂ gradually rises from rising to point b.

[0007]

However, even if the adjustment of the brightness level is performed while looking at the image displayed on the screen 86, the boundary between the composite portion and the normal image may not be clearly seen, and the adjustment point may be different. Is not easy to find and takes time to adjust. Also,
For example, the adjustment may be performed using a personal computer or the like, but in this case, image adjustment software corresponding to the model of the personal computer used is required. Furthermore, due to a problem such as an arrangement space, if the adjusting-side device such as an image adjusting device or a personal computer is not arranged at an optimum position for monitoring the combined image displayed on the screen 86, the image combining result will be displayed. In order to confirm the above, it was necessary to move away from the device on the adjustment side and back and forth between the optimum visual recognition points, and the adjustment efficiency was not good.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and includes a sync separator for extracting sync information of an input video signal and a horizontal sync frequency from the sync information. , A memory unit for storing correction data for correcting a video signal for at least one line corresponding to the horizontal synchronization frequency, a correction start point and a correction start point at a predetermined position corresponding to the horizontal synchronization frequency. A correction data calculation unit that calculates correction data having a correction end point, and a mark indicating the correction start point and / or the correction end point is displayed at the correction start point and / or the correction end point of the correction data. The video signal processing unit is configured to include a mark data generation unit that superimposes mark data to perform Together, it projected two or more video signal formed by the image signal processing unit on the screen 2
When the position of the correction data correction start point and / or the correction end point is adjusted by the operation unit, the mark data is added to the correction start point and / or the correction end point of the correction data. The composite image projection device is configured to superimpose and display the mark on the screen together with the projected image.

Further, when two or more video signals are projected on the screen by two or more projecting means to adjust the image of the overlapping area where the synthesized images overlap, the image to be adjusted from the synthesized image. Is selected, and whether the correction start point or the correction end point of the correction data for performing image adjustment is selected or the inclination of the correction curve is adjusted, and the correction start point of the correction data and / or The mark data is superimposed on the correction end point, and the mark formed by the mark data is displayed on the screen together with the projected image.

[0010]

According to the present invention, since a vertical line mark is displayed at the correction start point and / or the correction end point for correcting the brightness of the superimposed area when forming the composite image, this mark is displayed. By using as a guide for adjustment, adjustment operation becomes easier and adjustment efficiency is improved.

Further, since this adjustment can be performed by the remote operation means connected to the main body of the image adjustment apparatus, the user can carry only the remote operation means to the optimum position for the monitor and perform the accurate adjustment. . As a result, the adjustment operation can be facilitated and speeded up.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an outline of a composite video projection apparatus to which the present invention is applied will be described with reference to FIG. In this figure, a video signal source 20 for displaying a composite image is, for example, image information output from a computer 20A, multi-image data output from a laser disc player 20B, a playback video signal by a VTR 20C, and a television camera 20D. It is shown that the video signal of the subject directly output from the device is output as a video source. In addition, V
A single video signal output from the TR 20C, the laser disc player 20B, or the like is once captured as image data in the computer 20A, processed into a plurality of video signals for multi-screen, and output as R, G, B component signals. However, in this case, the synchronization information may be superimposed on, for example, the G signal, or may be derived as a separate signal using a dedicated cable.

The multi-video signals output from the video signal source 20 are preferably supplied as R, G and B components to a soft edge matching device 30 forming the signal processing device of the present invention. And this soft edge matching device 30 (hereinafter referred to as SEM device)
In the above, when projecting the composite screen as described above, signal processing is performed so that the joint portion becomes continuous, and three projecting devices 40A, 40B, and 4 are respectively provided.
It will be supplied to the composite image projection device 40 consisting of 0C. The signal processing is performed by the soft edge matching device 3
Remote control unit 3 which is a remote control unit connected to 0
It is executed by operating various operation keys arranged in 1. The remote control unit 31 will be described later in detail with reference to FIG.

The three projection devices 40 (A, B, C) are high-intensity cathode ray tubes (C) commonly used as projectors.
RT), the video signal is converted into a projected image and projected as a composite image on the horizontally long screen 50.
The projection device 40 (A, B, C) may be composed of a liquid crystal projector. Further, in the case of this embodiment, three projection devices 40 (A, B, C) are arranged side by side, but if this number is 2 or more, the signal processing device of the present invention is targeted. Therefore, in the embodiment described below, the case where the joint portion of the composite image is processed by two video screens will be described.

FIG. 2 is an explanatory view when the two images A and B are combined and displayed, and the horizontally long screen 50 shows a case where the projected images A and B are combined. Adjacent portions of the images A and B are superposed areas Q in which the images overlap each other. In this superposed area Q, signals are processed on the video signal source 20 side so that the images A and B are the same continuous image. It is being appreciated. That is, as shown in the video signal V _A of one horizontal period in FIG. 2, a video signal surrounded by a diagonally downward-sloping hatched portion from the correction start point A _E of one video signal V _A and the other video signal The video signal enclosed by the shaded portion toward the correction end point B _S of V _B is the video information of the same content, and the luminance level of this part is from the correction start point A _E to the correction end point B
_{During S} , the signal processing is performed so that the fade-out characteristic gradually decreases and the fade-in characteristic gradually increases as shown by the curve. In the present invention, as will be described later, for example, marks are displayed at the correction start point A _E and the correction end point B _S so that the image adjustment can be easily performed.

Therefore, when the image is projected on the screen 50 by the two projection devices 40 by performing such signal processing,
The brightness of the area Q of the screen 50 is the same as the brightness of the portions of the image A and the image B, and they can be combined so that the joints thereof are almost invisible. If the left end of one video signal V _A is processed to be slightly overscan area OS and the right end of the other video signal V _B is also overscan area OS, the screen 50 is displayed.
It is possible to prevent the edges of the images A and B from appearing at both ends of.

Further, when a composite image is displayed by the three projection devices 40, the video signals (only one horizontal period) a and c in the left and right portions are the same as in the case of FIG. 2 as shown in FIG. However, in the video signal b where the central screen is located, the end area a _E of the video signal a and the start area b _S of the video signal b are processed so as to have the same content. Also, the end area b _E of the video signal b and the start area c _S of the video signal c are processed so as to have the same content of the video signal. And
For the video signal b, the end point of the start area b _S is the correction end point, and the start point of the end area b _E is the correction start point. That is, when a composite image is formed by three or more images, the correction end points and the correction start points are formed on the same signal in the correction signals of the images other than the images at both ends thereof. Then, in the area from the correction end point to the correction start point, the fade-out and fade-in processing is performed, and the edge portion of the image is corrected at the two boundary portions generated when the images are combined.

Next, the functions of various operation keys arranged in the remote control unit 31 will be described with reference to FIG. The remote control unit 31 adjusts the width of the overlapping area Q, the correction start point A _E , the correction end point B _S , and the like shown in FIG. 2 when the three systems of video signals are combined to form a large screen. , Which is a remote commander, and various input commands are input to the soft edge matching device 30 through a dedicated connection cable.

The remote control unit 31 is provided with operation keys such as an image selection key group 32, an SEM selection key group 33, and moving direction selection keys L and R. In the vicinity of each operation key of the image selection key group 32 and the SEM selection key group 33, a select lamp i that is turned on when the key is selected is arranged. Although three image selection keys 32a, 32b, and 32c are provided here corresponding to the left, center, and right images shown in FIG. 1, the number of image selection keys 32a, 32b, and 32c is actually provided as many as the number of displayed images. Become.

The image selection keys 32 (a, b, c) are keys for selecting an image to be subjected to the above various adjustments,
For example, when the image selection key 32a is selected, the left image displayed by the projection device 40A shown in FIG. 1 is selected. Similarly, the image selection key 32b selects the central image, and the image selection key 32c selects the right image. S
An operation key for selecting the SEM processing is arranged in the EM selection key 33 group. For example, when the start point selection key 33a is operated, for example, the position of the start point of the SEM processing shown in FIG.
When the SEM selection key 33b is operated, the slope of the video signals V _A and V _B in the superposition area Q is moderate, and the end point selection key 33 is displayed.
When c is selected, the mode is switched to the mode for adjusting the position of the end point of the SEM processing. Move direction selection keys L and R are SEM
These are operation keys for executing the adjustment selected by the selection key group 33. For example, the correction start point A _E of the SEM processing shown in FIG.
Position, the slope of the video signals V _A and V _B in the overlapping region Q, and the position of the correction end point B _S are moved to the left and right.

Here, an example of the adjustment when the image A shown in FIG. 2 is the left image and the image B is the right image will be described. First, the image selection key 32a is operated to select the image A, and then the SEM selection key 33c is operated to select the adjustment of the correction start point A _E. When the moving direction selection key L is operated, the correction start point A _E shifts to the left, and when the moving direction selection key R is operated, the correction start point A _E shifts to the right. At this time, the inclination of the right end of the video signal V _A is moved in parallel without being changed. Next, the image selection key 32b is operated to select the image B, and thereafter, the position of the correction end point B _S of the image B is shifted to the left and right by the same operation, so that the correction start point A _E and the correction end point B _S The width of the overlapping area Q composed of is adjusted.

For example, when the width of the overlapping area Q is changed,
The SEM selection key 33b is selected to adjust the slope of the video signals V _A and V _B. In this case, the correction start point A _E of the video signal V _A is rising point of the video signal V _B, also correction end point B _S of the video signal V _B is set to be falling point of the video signal V _A. That is, the width of the overlapping area Q (images A and B)
If it is narrow, the curve becomes steep, and if it is wide, it becomes a gentle curve. The various operation keys arranged on the remote control unit 31 may be provided on the main body of the soft edge matching device 30 as operation units.

FIG. 5 is a diagram showing a partial circuit block of a soft edge matching device 30 for performing signal processing for performing signal processing of the superposed portion Q, which is performed when the above-mentioned composite screen is projected. Although only one system circuit block corresponding to one projection device 40 shown in FIG. 1 is shown here, a plurality of inputs corresponding to the number of projection devices 40 actually arranged are shown. / Output system is configured.

The video signal input terminals R _in , G _in , and B _in are, for example, the video signal source 20 shown in FIG.
0A, laser disc player 20B, VTR 20C
Etc.) is a terminal for inputting a video signal supplied from a video source. These video signal input terminals R _in , G _in , B _in
Video signals R corresponding to red, green, and blue colors input from
G and B are clamped by the buffer amplifiers 60a, 60b, and 60c, respectively, and then the multipliers 71a and 7 to be described later, respectively.
Video signal output terminal R _out , whose brightness is adjusted by 1b and 71c,
Output from G _out and B _out , and are supplied to the projection device 40 (A, B, C) not shown in the figure.

The horizontal synchronizing signal input terminal H _Din and the vertical synchronizing signal input terminal V _Din are terminals for inputting horizontal and vertical synchronizing signals separated from video signals as in computer graphics, for example. The vertical synchronizing signal VD input here is output from the vertical synchronizing signal output terminal _VDout as it is, and the horizontal synchronizing signal HD is output from the horizontal synchronizing signal output terminal _HDout and is also supplied to the phase synchronizing control unit 63. It Further, for example, when the synchronization signal is superimposed on the video signal G input from the video input terminal G _out , the video signal G is also supplied to the synchronization separation unit 61 to extract the synchronization signal (horizontal / vertical). It will be.

The sync separator 61 extracts the horizontal sync signal supplied by being superimposed on the video signal G, for example, and supplies it to the phase sync controller 63 (product name KS6369 manufactured by Craias) and the horizontal sync measurement unit 69. . The reference clock generation unit 62 is composed of, for example, a crystal oscillator or the like, and outputs a fixed clock CLK of, for example, 40 MHz regardless of the input synchronizing signal. The phase synchronization control unit 63 has a horizontal synchronization signal input terminal H.
_Din, or by entering the supplied horizontal synchronizing signal H _D from the synchronous separating section 61 to phase lock the clock CLK of the test is the example 40MHz from the reference clock generating unit 62. (By the pulse width in this case for example the horizontal synchronizing signal H _D every clock CLK fluctuates irregularly, resulting appears intensity variation in the output image) where the phase-locked correcting jitter of the output image by preventing ing.

Since the accuracy of the clock CLK directly affects the image quality of the output video, the reference clock generator 6
2 is preferably composed of a crystal oscillator or the like, which is superior in accuracy and stability to, for example, a PLL circuit. This can be realized by, for example, a TTL crystal oscillator.

The address counter 64 is the phase synchronization controller 6
3 is a counter for reading the data of the following memory (RAM ... Random Access Memory) 65 by the clock signal output from the memory 65. For example, the correction data of one horizontal period is 12 bits of the address data from the memory 65. read out.

A CPU (Central Proc.
signal processing of the superposition area Q set by the essing unit 70, that is, as shown in FIGS. 6A and 6B, the luminance signal gradually rises in the start area S and gradually increases in the end area E. The correction data of, for example, the cosine curve that decreases, is written, and this data is shown in FIG.
The overlapping area Q shown in (from the correction start point A _E to the correction end point B
_S period). Further, in this embodiment, the correction data is composed of, for example, 8-bit data and the read cycle is set to 25 ns, but this value can be changed in consideration of the memory capacity and the price.

In this embodiment, this read cycle is constant regardless of the horizontal frequency of the input video signal because the frequency of the reference clock signal CLK is fixed at (40 MHz). Therefore, the A /
D converter 67 and filter (cutoff frequency 20
As the MHz smoothing filter 68, one having a constant characteristic can be used regardless of the horizontal frequency of the input video signal, and the signal processing circuit can be simplified.

When a video signal with a horizontal frequency of, for example, 15 KHz is input, signal processing is performed with correction data of approximately 2667 samples in one horizontal period, and when the horizontal frequency is, for example, 93 KHz, there are approximately 431 samples. Will be corrected with the data. Therefore, in the present embodiment, a detection unit for detecting the horizontal frequency of the input video signal is provided, and when the video signals of different systems are combined and projected, the memory 6 is associated with the horizontal frequency of the video signal.
The content (storage address) of the correction data stored in 5 is changed, the correction data is always read at a constant cycle, and the correction data is supplied to the multiplier 71 (a, b, c) to superimpose the video signal. Q signal processing is performed.

When the SEM processing is performed using the remote control unit 31 described with reference to FIG. 4, for example, the mark generating section 66 is, for example, white, which is a reference for adjustment, at the rising end point and the falling start point of the SEM correction curve. Mark data for displaying the mark is stored.
The mark generator 66 may be included in the CPU 70, which will be described later.

When the correction start point A _E and the correction end point B _S are adjusted by the remote control unit 31, for example, as shown in FIG. 7, the correction start point A _E and the correction end point B _S of the correction data are set. Mark data M _D1 and M _D2 whose brightness is, for example, about 1.15 times (115%) that of the input image.
To form. Further, the mark data M _D1 and M _D2 are overlapped with each time the movement direction selection keys L and R are operated to adjust the correction start point A _E and the correction end point B _S , that is, the memory. 70 addresses are arrows P ₁ and P
It is changed to the direction indicated by ₂ .

When the mark data M _D1 and M _D2 are superimposed,
Since the brightness of the correction end point A _E and the correction end point B _S increases,
For example, white marks M ₁ and M ₂ are displayed at positions corresponding to the correction start point A _{E of} the image A and the correction end point B _S of the image B, that is, the mark data M _D1 and M _D2 . The marks M ₁ and M ₂ move in the horizontal direction each time the moving direction selection keys L and R of the remote control unit 31 are operated, and for example, about 0.5% of the entire image (horizontal synchronization to horizontal synchronization) is displayed. Displayed in width.

Here, for convenience, the mark M of the image A is
_{Although 1} and M ₂ of the image B are shown at the same time, they may be displayed only on the image (either A or B) currently being adjusted, for example. Also, mark M
( ₁ , ₂ ) is displayed on the image when the operation key of the SEM selection key group 33 is input, and for example, the moving direction key L
Alternatively, the key may be erased immediately after R is turned off, or at a predetermined time (for example, about 3 seconds) after being turned off, or a dedicated key for displaying and erasing the mark M ( ₁ , ₂ ). May be provided. Further, the display color of the mark M ( ₁ , ₂ ) is not limited to white, and may be any color as long as it is a color that is easily visible on the image.

Returning to FIG. 5, description will be made again. The correction data read from the memory 65 is converted into an analog correction signal by the D / A converter 67 and supplied to the filter 68.
The filter 68 smoothes the correction signal converted into the analog signal by the D / A converter 67 and supplies it to the multipliers 71a, 71b, 71c as a brightness correction signal. The horizontal sync measuring unit 69 is the sync separating unit 61 or the horizontal sync signal input terminal H _Din.
By measuring the frequency of the horizontal synchronizing signal H _D supplied from,
The measurement result is supplied to the CPU 70.

The CPU70 is controls the respective functional circuit, when the frequency of the horizontal synchronizing signal H _D by measurement of the horizontal synchronizing measuring unit 69 changes, optimum correction curve corresponding to the horizontal synchronizing signal H _D It has a calculation means for calculating data. Also, for example, the remote control unit 3
When the control command for performing the SEM processing is input by 1, the control for superimposing the mark data described above with reference to FIG. 7 on the correction curve data is performed.

Multipliers 71a, 71b and 71c are provided with video signals R, G, and G _in input from video input terminals R _in , G _in and B _in , respectively.
B is multiplied by the analog correction signal (luminance correction signal) output from the filter 68. The video signals R, G, B adjusted to have a predetermined brightness are buffer amplifiers 72a, 7a.
Video output terminals R _out , G _out , and B via 2b and 72c
It is supplied from _out to the projection device 40 shown in FIG.

Next, the flow of processing for superimposing the mark data on the correction data and displaying the mark M on the image to perform adjustment according to the flowchart of FIG. 8 will be described. In this flowchart, an example will be described in which the mark M is displayed only while operating the moving direction selection keys L and R, for example. Then, here, a case will be described as an example in which adjustment is performed on the two images (left and right) illustrated in FIG. 7.

First, an image whose edge portion is to be adjusted is selected with the image selection keys 32 (a, b, c) (S00
1) Further, the SEM selection key 33 (a, b, c) is used to select which of the correction start point, the slope of the curve and the correction end point is to be adjusted (S002). Then, by selecting and inputting either the movement direction key L or R (S003), the image adjustment is started, and at the same time, the mark data is superimposed on the correction data and the mark M is displayed ( S004).

Here, for example, the image A is pressed by the image selection key 32a.
Is selected and the adjustment of the correction start point A _E is selected by the SEM selection key 33a, and the movement direction key L is input, the correction start point A _E moves to the left and the mark M The display position of will also move to the left (S005). Then, in step S006,
When it is determined that the moving direction key L or R is being input, steps S004 to S005 are repeated to continue displaying the mark M. If it is determined in step S006 that the input of the movement direction key L or R is completed, the process proceeds to step S007 and the display of the mark M is completed. That is, in the example described here, the mark M is not displayed at the time when the adjustment is finished, so that the troublesomeness of the mark M when checking the image after the adjustment can be reduced.

Further, for example, when the mark M is displayed for a predetermined time after the input of the movement direction key L or R is completed in step S006, after the predetermined time is counted by, for example, the timer means in step S007. The mark M should be erased. Further, when a dedicated operation key for mark display / erasure is provided, for example, step S0
Display the mark M with the mark display key at any timing before the movement direction key is input in 03,
For example, the end of the display of the mark M in step S007 may be manually performed by the mark erasing key.

[0043]

As described above, according to the present invention, the vertical line marks are displayed at the correction start point and the correction end point for performing the brightness correction of the overlapping area when forming the composite image. Since the boundary between the overlapping area and the normal area can be visually confirmed, the adjustment operation is facilitated and the adjustment efficiency is improved. Further, since no adjustment device or software such as a personal computer is needed, the adjustment system can be simplified and the versatility can be improved.

Further, since this adjustment can be performed by the remote control unit connected to the main body of the image adjusting apparatus, the main body of the image adjusting apparatus may not be suitable for monitoring the image projected on the screen depending on the conditions of the installation place. Even when they are arranged, the user can carry out adjustments with high accuracy by carrying and adjusting only the remote control unit at the optimum position for the monitor. As a result, it is not necessary to wastefully go back and forth between the optimum position of the image adjustment device main body and the monitor, and the adjustment status can be confirmed while staying at the optimum viewing point, which facilitates the adjustment operation and speeds it up. There is an advantage that you can.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a usage mode of a synthetic image projection apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a composite image projected on a screen.

FIG. 3 is a diagram showing signal waveforms when synthesizing video signals of three channels.

FIG. 4 is a diagram illustrating operation keys of a remote control unit of the soft edge matching device according to the present embodiment.

FIG. 5 is a diagram showing a partial circuit block of the soft edge matching device of the present embodiment.

FIG. 6 is a diagram schematically showing rising and falling of correction data.

FIG. 7 is a diagram schematically showing mark data to be superimposed on a correction start point and a correction end point of correction data.

FIG. 8 is a diagram showing a flow of processing when a mark is displayed.

FIG. 9 is a diagram illustrating a conventional example of a device that projects a composite image.

FIG. 10 is a diagram showing a pattern of an edge portion of a composite image and a correction characteristic of a video signal.

[Explanation of symbols]

20 video signal source 30 Soft edge matching device 31 Remote control unit 40 Composite Image Projector 50 screen 61 Sync Separator 65 memory 66 mark generator 70 CPU

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-300452 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/74

Claims (3)

(57) [Claims] 1. A sync separator for extracting sync information of an input video signal, a frequency measuring unit for obtaining a horizontal sync frequency from the sync information, and a video signal for at least one line corresponding to the horizontal sync frequency. A memory unit for storing correction data to be corrected; a correction data calculation unit for calculating correction data having a correction start point and / or a correction end point at a predetermined position in correspondence with the horizontal synchronization frequency; At the correction start point and / or the correction end point,
A mark data generating section for superimposing mark data for displaying a mark indicating the correction start point and / or the correction end point; and an operation section for supplying a command for reading the correction data and executing image adjustment. A video signal processing section is provided, and two or more projection sections for projecting two or more video signals formed by the video signal processing section on a screen are provided, and the correction start point of the correction data is set by the operation section. , And / or when adjusting the position of the correction end point, the mark data is superimposed on the correction start point and / or the correction end point of the correction data to display the mark together with the projected image on the screen. And a composite image projection device. 2. The composite image projection device according to claim 1, wherein the operation unit is configured by a remote operation unit connected to the video signal adjustment unit. 3. An image to be adjusted from the combined image when projecting two or more video signals on a screen by two or more projecting means to adjust an image in a superimposition region where the combined images overlap each other. Select the correction start point or the correction end point of the correction data for the next image adjustment, or the slope of the correction curve, and select the correction start point of the correction data, and / or An image adjusting method, wherein mark data is superimposed on a correction end point, and a mark formed by the mark data is displayed together with a projected image on the screen.